Update the system and use podman, again

.gitlab-ci.yml

@@ -4,13 +4,14 @@ stages:
 build:
   stage: build
   tags:
-    - docker
+    - nix
+    - podman
   script:
-    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - podman login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
     - |-
       for img in vm-test; do
         nix build ".#${img}"
-        docker load -i result
-        docker tag "${img}" $CI_REGISTRY/greg/ci-images/${img}:latest
-        docker push "$CI_REGISTRY/greg/ci-images/${img}:latest"
+        podman load -i result
+        podman tag "${img}" $CI_REGISTRY/greg/ci-images/${img}:latest
+        podman push "$CI_REGISTRY/greg/ci-images/${img}:latest"
       done